<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <style>
        *{
            /* box-sizing:border-box */
        }
        body{
            height: 99vh;
            place-items: center;
        }
        .container{
            display: flex;
            height: 100%;
            width: 100%;
            
        }
        .container_col {
            background: red;
            width: 100%;
            height: 100vh;
            margin: 1%;
            place-items: center;
            flex-direction: row;
        }
     
        .item_row {
            background: rgb(0, 0, 0);
            flex: 1;
       
            
            /* height: 100%; */
            margin: 10px;
            /* height: 30%; */

        }
    </style>
    <div class="container">
        <!-- 3列 -->
        <div class="container_col">
            <div class="item_row">

            </div>

            <div class="item_row">

            </div>
            <div class="item_row">

            </div>
            
        </div>

        <div class="container_col">
            <div class="item_row">
                
            </div>
        </div>

        <div class="container_col">
            <div class="item_row">

            </div>

            <div class="item_row">

            </div>
            <div class="item_row">

            </div>
        </div>
        
        
    </div>

</body>

</html>